Birnessite manganese oxide powder with ultrahigh specific capacitance characteristic as well as preparation method and application thereof

A technology of birnessite type and birnessite, applied in chemical instruments and methods, manganese oxide/manganese hydroxide, manganese compounds, etc., can solve the problems of low discharge specific capacity, poor cycle stability, and poor performance of supercapacitor materials, etc. problems, to achieve the effect of wide application, high production efficiency, and excellent specific capacitance characteristics

Active Publication Date: 2015-02-18
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Currently preparing MnO 2 The methods mainly include liquid phase precipitation method, sol-gel method, electrochemical deposition method, low temperature solid phase method and hydrothermal method, etc., but the MnO prepared by most methods 2 As a supercapacitor material, the performance is not good, and there are mainly problems such as low discharge specific capacity and poor cycle stability.
This limits the MnO 2 Large-scale application in the supercapacitor industry

Method used

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  • Birnessite manganese oxide powder with ultrahigh specific capacitance characteristic as well as preparation method and application thereof
  • Birnessite manganese oxide powder with ultrahigh specific capacitance characteristic as well as preparation method and application thereof
  • Birnessite manganese oxide powder with ultrahigh specific capacitance characteristic as well as preparation method and application thereof

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Effect test

Embodiment 1

[0027] Weigh 2.424g potassium permanganate (KMnO 4 ) was dissolved in 90ml deionized water, magnetically stirred for 10min, and 0.806g citric acid (C 6 h 7 o 8 ·H 2 O) Dissolve in 10ml of deionized water, drop the citric acid solution into the potassium permanganate solution with a dropper, stir while adding, then place the precursor solution in an atmosphere tube furnace at 250°C 30min, cooled to room temperature to collect the product, washed 3 times with deionized water, and then placed in a vacuum oven at 60°C for 12h.

Embodiment 2

[0029] Weigh 0.182g potassium permanganate (KMnO 4 ) was dissolved in 90ml deionized water, magnetically stirred for 10min, and 0.806g citric acid (C 6 h 7 o 8 ·H 2O) Dissolve in 10ml of deionized water, drop the citric acid solution into the potassium permanganate solution with a dropper, stir while adding, then place the precursor solution in an atmosphere tube furnace at 120°C 30min, cooled to room temperature to collect the product, washed 3 times with deionized water, and then placed in a vacuum oven at 60°C for 12h.

Embodiment 3

[0031] Weigh 7.277g potassium permanganate (KMnO 4 ) was dissolved in 90ml deionized water, magnetically stirred for 10min, and 0.806g citric acid (C 6 h 7 o 8 ·H 2 O) Dissolve in 10ml of deionized water, drop the citric acid solution into the potassium permanganate solution with a dropper, stir while adding, then place the precursor solution in an atmosphere tube furnace at 120°C 30min, cooled to room temperature to collect the product, washed 3 times with deionized water, and then placed in a vacuum oven at 60°C for 12h.

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Abstract

The invention discloses a birnessite manganese oxide powder with ultrahigh specific capacitance characteristic as well as a preparation method and application thereof. The manganese oxide powder has an ideal chemical formula of M[2x]MnO[2+x], and in the formula, M is any combination of Li, Na and K positive ions and x is 0.1-0.5. The preparation method comprises the following steps: controlling the mole ratio of permanganate and organic fuel, and dropwise adding an organic fuel solution into a permanganate aqueous solution; heating in a muffle furnace to obtain the required birnessite manganese oxide powder. According to the birnessite manganese oxide powder disclosed by the invention, production raw materials are low in price, equipment is simple, the production efficiency is high, and the specific capacitance characteristic is excellent (the specific capacitance can reach 1,055F.g<-1> under the current density of 1A.g<-1>); the birnessite manganese oxide powder can be applied to the fields of supercapacitors, lithium/sodium/magnesium ion batteries, ion exchange, water photolysis and the like, and is wide in application range.

Description

technical field [0001] The invention belongs to the preparation and application of manganese oxide in the fields of chemical industry and materials, and specifically relates to a birnessite-type manganese oxide powder with ultra-high specific capacitance characteristics and a preparation method and application thereof. Background technique [0002] Supercapacitors are new energy storage components between traditional capacitors and batteries. They have the characteristics of high power output, high charge and discharge efficiency, and long cycle life. They have broad application prospects in mobile communications and electric vehicles. At present, the research on supercapacitors is mainly focused on improving the energy storage density per unit volume, and the synthesis of new electrode active materials is the key. [0003] At present, the electrode materials used for supercapacitors mainly include carbon materials, transition metal oxides, and conductive polymers. Each of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02C08G73/06C08G73/02C08K3/22
CPCC01G45/1221C01P2004/03C01P2004/04C01P2006/40C08G73/0266C08G73/0611C08K3/22
Inventor 康利涛李培养卫爱丽刘一鸣崔芒伟邓加春李影梁伟
Owner TAIYUAN UNIV OF TECH
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